grep [:digit:]实例

Finally,  certain  named  classes  of  characters are predefined within bracket expressions, as follows.  Their
names are self explanatory, and they are [:alnum:],  [:alpha:],  [:cntrl:],  [:digit:],  [:graph:],  [:lower:],
[:print:], [:punct:], [:space:], [:upper:], and [:xdigit:].  For example, [[:alnum:]] means [0-9A-Za-z],

[[:upper:]]   [A-Z]
[[:lower:]]   [a-z]
[[:digit:]]   [0-9]
[[:alnum:]]   [0-9a-zA-Z]
[[:space:]]   空格或tab
[[:alpha:]]   [a-zA-Z]

例如：

find abc/ -type f |grep -i \'[]{100}'

grep -i \'[a-z]{100}\' a.txt

tail -f looyuoms7814.log |grep \'[:graph:]\{100,}'

/^\S{1,100}$/

grep  -o '[0-9]\{2\}' a.log

tail -f looyuoms7814.log |grep '[[:graph:]]\{200,\}'
grep  -o '[0-9]\{2\}' a.log
grep '5[[:upper:]][[:upper:]]' data.doc     #查询以5开头以两个大写字母结尾的行

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